A fix is available
APAR status
Closed as program error.
Error description
MQ routine CSQENTFY is setup as a NOTIFYEXIT on IXLCONN connections to CF structures. It obtains a small amount of stack storage and then immediately frees it. If there is lots of CF structure lock contention, then this routine will be driven very frequently. The repeated freeing and releasing of storage should be reduced.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0 * * Release 2 Modification 0 and * * Release 3 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Repeated storage obtain/release seen * * in systrace when there is contention * * for a list lock in an application * * structure. * **************************************************************** When a list lock is requested while already held by another task and/or queue manager, the MQ notify exit CSQENTFY is called. When significant contention for locks occurs, the many calls to CSQENTFY can result in the same area of storage being repeatedly obtained and released unnecessary.
Problem conclusion
CSQENTFY is changed to remove the requirement to obtain and release the storage on each invocation.
Temporary fix
Comments
APAR Information
APAR number
PH39461
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-07-30
Closed date
2022-07-21
Last modified date
2022-09-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI81593 UI81594 UI81595
Modules/Macros
CSQENTFY
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI81595
UP22/08/03 P F208
R200 PSY UI81594
UP22/08/03 P F208
R300 PSY UI81593
UP22/08/03 P F208
Fix is available
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Document Information
Modified date:
01 September 2022